422 



Special Reports 



NO. 5. ESKDALEMUIR OBSERVATORY, SCOTLAND. 



The comparisons of 1915 were obtained by Superintendent L. F. Richardson and 

 Mr. P. N. Skelton of the Observatory staff and Observer E. Kidson of the Carnegie 

 Institution of Washington. The observations were made in the west and east absolute 

 houses, each of which contains 3 piers lying in a magnetic east-west line. The piers in 

 the 2 houses are numbered 1 to 6, beginning with the west pier in the west house as No. 1. 

 The observations for magnetic declination and for magnetic horizontal intensity were 

 made on piers 2 and 5, and those for magnetic inclination were made on piers 3 and 6. 

 The Observatory azimuth mark, a vertical white band on a stone pillar one-half mile 

 distant, was used; the true bearings of this mark from piers 2 and 5, supplied by Super- 

 intendent Richardson, were 4 36'. 2 and 8 12'. 5 west of south, respectively. 



The Observatory instruments used were magnetometer No. 60 by Elliott and earth 

 inductor No. 103 by Schulze. The values for intensity with magnetometer No. 60 

 depend upon the values of the distribution coefficients finally adopted by the Observ- 

 atory authorities. The C.I.W. instrument used was magnetometer-inductor No. 26. 

 The corrections on International Magnetic Standards," applied to results obtained with 

 magnetometer-inductor No. 26, were those finally adopted. 



Table 5A. Results of Declination Comparisons at the Eskdalemuir Ohse 



rvatory, 1915. 



1 All values are referred to pier 5; pier 5 = pier 20'. 8. 

 Table 5B. Results of Horizontal-Intensity Comparisons at the Eskdalemuir Observatory, 1915. 



1 The times given apply for the C. I. W. observations; the Eskdalemuir observations were not strictly simultaneous 

 but where necessary have been reduced to times of the corresponding C. I. W. observations by differences determined from 

 the magnetograms. 



All values are referred t.> pie, :,: pier 5 = pier .' 3-,. 



See Re. I>. t >. Terr. Mag., Vol. II, pp. 270-278. 



